According to the below regulations, we can learn that all pipes and fittings made of pipes shall not have the following defects:

a. Any quenching crack

b. Any arc burn

c. Any surface cracking defect that reduces the net effective wall thickness to less than 87.5% of the specified wall thickness can be confirmed.

d. When non-destructive inspection is specified in this standard or on an order, any non-surface cracking defects on the outer surface having an area greater than 260 mm2 (0.41 in2) are detected.

e. Any non-surface cracking defect that reduces the effective wall thickness to less than 87.5% of the specified wall thickness can be confirmed within 1.6 mm (1/16 in) of both sides of the weld.

f. Any internal upset structure on all upset products may have any sharp corners or drastic change of sections that can cause the 90 ° hook type tool to hang up.

g. Any non-linear surface cracking defects on the inner surface of the external threaded part of the sanitary tube with a depth greater than 10% of the specified wall thickness.